Arter came on for MacDonald when he ruptured ankle ligaments in the victory over Colchester, having missed the previous two matches through injury and suspension, and is likely to deputise on Boxing Day.
Richard Hughes is back in training after suffering a hamstring injury back in October but remains a doubt.
The midfielder was left out of the squad for the Saturday's match against Crewe, which was cancelled due to a waterlogged pitch, but could return in time to play some part on Wednesday.
Miles Addison is definitely out with an ankle injury but Shwan Jalal is back in contention again after recovering from a thigh strain.
Fellow goalkeeper Darryl Flahavan remains on the sidelines as does Stephen Purches while Charlie Sheringham continues to make progress.